Remote display pressure gauge.

[Brian1]

I am looking for a schematic to make a digital display pressure gauge.
Range would be 0-99psi
Small segment display is what I am after.
Fluids could be air to oil to measure.

Now example is this but not wanting the 2" display housing. No idea the internals so not looking at buying it to see yet.
STi & WRX Performance Parts: Autometer "Digital Series" White Face 2 1/16" Fuel Pressure Gauge 0-100 PSI

Thanks for your help.
Brian